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LP87745-Q1: how to turn on SS mode of LP877451-Q1?

Wenting Wu
Intellectual 1750 points
Part Number: LP87745-Q1

Hello,

One of my customers is using LP877451-Q1 in their Columbus platform, now they want to activate spread spectrum mode, but it fail , the pmic reset by itself.

The following is what the customer did in their software:

1.unlock the register

  1. read register value RES from INTERFACE_CLK_CONF(0x1B)
  2. write RES&0x80 to INTERFACE_CLK_CONF(0x1B)

Could you tell us how to turn on SS mode of LP877451-Q1?

Best regards,

wenting 

  • +1
    TI__Expert 6430 points

    Hi Wenting,

    Thank you for reaching out. SS mode can be enabled following way.

    After unlocking the resgisters,

    2. Clear the CRC interrupts (CONFIG_CRC_INT) if there are any

    3. Disable CRC or Mask CRC interrupt by CONFIG_CRC_MASK

    4. Then enable SS by SS_EN 

    If the CRC is unmasked or enabled, it won't allow SS to get enabled. See data sheet section  8.4.1.1 on p.70. 

    Best Regards,

    Ishtiaque Panhwar

  • +1 in reply to Ishtiaque Panhwar
    TI__Intellectual 1750 points

    Hello Panhwar,

    Thanks for your reply. we found that an old datasheet is used by us previously and we've followed the updated datasheet.

    Best regards,

    Wenting